Royal Observatory Greenwich
About
The Royal Observatory in Greenwich, London, is a historic milestone in the story of timekeeping and astronomy. Founded in 1675 by King Charles II and designed by Sir Christopher Wren, the observatory sits on the hilltop of Greenwich Park, overlooking the Thames and the site’s early astronomical laboratories. From its inception, the Observatory has shaped global navigation. The fact that the world’s Prime Meridian—0° longitude—passes through its courtyard gave rise to Greenwich Mean Time, the original standard for civil time. Visitors watch the famous crude time ball descend at noon, a living reminder of the Observatory’s role as the world’s timekeeper. Today the Royal Observatory is part of the Royal Museums Greenwich network, offering a first‑class museum experience. Inside the Octagon Room—a former astronomical room—enthusiasts can see early instruments, the giant 21‑inch Great Equatorial Telescope under the onion dome, and the historic mechanism that launched the time ball. Audio guides in multiple languages and daily tours bring the story of the Observatory to life for families and school groups. The site also hosts a variety of events, including talks, guided tours, and temporary exhibitions. Members enjoy unrestricted entry, while visitors can purchase tickets in advance online, freeing them from queues. The Observatory’s blend of science, history and immersive experience makes it a unique destination in London’s cultural landscape.
Highlights
- Prime Meridian Line
- Great Equatorial Telescope
- Octagon Room
- Time Ball
- Peter Harrison Planetarium
- Audio Guide Attraction
Must-See Areas
Good to Know
Good for
Best time to visit
Spring and autumn offer mild temperatures and fewer crowds, giving visitors a comfortable window for exploring the Observatory’s historic rooms and the open‑air Prime Meridian line.
Frequently Asked Questions
At a glance
- Typical visit: about 2 hours
Tickets & pricing
Adult
£24.00
Child
£12.00
Under 4
£0.00